Keyless padlock



KEYLESS PADLOCK.

Specification of Letters Patent. Patnted June 10, 1919,

Application filed May 29, 1918. Serial N o. 237,257.

Toall 'whom t may concern;

Be it known that I, JENNINGS E. GHISA- MORE, a natural-born citizen ofthe United States, residing at Jamesport, in the county of Grundy andState of Missouri, have invented certain new and useful Improvements inKeylessPadlocks, of which the following is a specification.

This invention relates to padlocks, and more especially to those Vhavinga pivoted shackle and a sliding bolt; and the object of the saine is toproduce a keyless padlock of the permutation type which may be unlockedonly by a person whoknows how.

'Io this end the invention consists in a padlock whose shackle is lockedby a springpressed bolt when its tip is passed into the casing, or isunlocked by applying pressure to said tip and at the same timeretracting the bolt.

Details are set` forth in the following specification and claims, andare shown in the drawings herewith and in which Figure 1 is an elevationof this padlock with the face of the casing removed and the spring insection.V

Fig. 2 is a vertical sectional view on the line 2 2 of Fig. 1.

The casing of this padlock is preferably circular. It comprises a cuppedback plate 1 whose flange 2 has openings 3 and l for the shackle; and adisk-like face plate 5 overlying the flange 2 of the back plate andconnected centrally with said plate by a rivet 6 so that the two partsare rotatable with respect to each other. The shackle 7 passes throughone opening 3 and is pivoted to the back plate at 8, and its other oroperative end passes loosely through the opening 4: and is locked withinthe casing when the padlock is locked, or is withdrawn from said openingand turned back on its pivot 8 when the padlock is unlocked. The free oroperative end of the shackle is provided with a hook 10 whose bill isundercut slightly as indicated at 11, and the tip of the hook is beveledas shown `at 12. A spring of strip metal has a loop 18 inclosing therivet 6, its front leaf 14 underlying the tip 12 of the hook Vwhen thelatter is within the casing, and its rear leaf 15 upstanding from therivet 6 in a position about at right angles to its front leaf 14.Between guides 16 in the back plate slides a bolt 17 whose forward endis enlarged or headed as indicated at 18,

preferably by causing its lower edge to descend slightly to the tip ofthe bolt, and this enlarged Jortion engages with the undercut bill 11 ofthe hook when the front leaf 14 bears said hook upward as seen inFig. 1. Therefore when the bolt is projected and engaged with the hook,not only can the hook not be drawn through the opening l but the boltcannot be disengaged from the hook until the hook is first pressedinward a little.

An appropriate link 2O connects the rear end of the bolt 17 with theupper extremity mof the rear leaf 15, and a pin 21 carried by the faceplate 5 projects into the cupped portion of the casing forward of saidleaf 15. When said base plate is turned to the right with respect to theback plate, the pin 21 will travel around the pivot 6 as shown in Fig.1, and as it does so it will bear on the leaf 15, draw on the link 20,and retract the bolt 17. Meanwhile, if the operator is moving theshackle inward so that the undercut portion 11 of the hook is free todisengage the head 18 of the bolt, then it is clear that the bolt can bewithdrawn by the rotation of the face plate. Thusit will be seen that tounlock this padlock two motions are necessary; first the operator withone hand must bear the hooked end of the shackle inward and next withthe other hand he must simultaneously rotate the face plate with respectto the back plate. It is quite possible that this compound orsimultaneous action could be discovered by an unauthorized person, but Iconsider it not at all likely. Many persons would press the front end,wiggle it about, draw it outward, and in other ways endeavor todisengage it from the bolt. Others might discover that one part of thecasing rotated with respect to the other, but the rotation would not beconsiderable unless the bolt were unlocked, as it were, from the hook atthe saine time, and therefore I do not consider it probable that anyonewho probably found the parts of the casing to be relatively rotatablecould unlock it. I find-by experience that such a sinall per cent. ofpersons can unlock this padlock without knowning how, that it ispractically safe to use it where padlocks are considered suflicientprotection. At any rate, it has no keyhole and no key and really it hasno permutation although it acts in a measure on the permutationprinciple.

The foregoing description and the drawings have reference to what may beconsidered the preferred, or approved, form of my invention. It is to beunderstood that I may make such changes in construction and arrangementand combination of parts, ma-v terials, dimesions, et cetera, as mayprove expedient and fall within the scope of the appended claims.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, iszl. In a padlock, the combination with acasing consisting of a cupped back plate, a disk-like face plate, andpivotal connections between the two plates at theirv axis; of a shacklepivoted at one end in the back plate and havingy a hook at its otherend, a bolt slidably mounted in guides in the back plate for engagementwith said hook, means on the hook preventing the retraction of the bolt,a spring Jfor holding these parts in such engagement, an element mountedon thea pivot between the plates, a link connecting it with said bolt,and a pin in the movable face plate bearing against said element andCopies of this patent may be obtained for moving it and retracting thebolt when the face plate is turned kon its ivot.

2. In a padlock, the com ination with a casing consisting of a cuppedback plate, a disk-like face plate, and pivotal connections between thetwo plates at their aXis; of a shackle pivoted at one end lin the backplate and having a hook at its other end with an undercut bill, a boltslidably mounted in guides in the back plate and having a headed innerend for engagement with said hook, means for holding `it in suchengagement, a spring mounted on the pivot between said plates, one armengaging'the tip ofthe shackle and the other arm being-connected v with.said bolt, Vand a pin inthe/facie plate contacting with the last-namedarm whereby rotary movement of the face plate' with respect to the backplate retractsthe bolt.

In testimony whereof I aiix my signature in presence of two witnesses.

c JENNINGS E. GRISAMORE.

Witnesses: Y

IRA C. GRisAMoRE, JN0. W. LIVELY.

ve cents each, by addressing the Commissioner Vof Patents, Washington,D. C.

